Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.31 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

12.19 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

414 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

10.39 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

12.40 s

Page Load Progression

1.1 s

2.2 s

3.4 s

4.5 s

5.6 s

6.7 s

7.8 s

9.0 s

Checks

19 PASS 3 REVIEW 2 FIX

Page Weight Budget

Action

3.4 MB transferred, 473 requests

FIX

3.4 MB transferred, 473 requests

Page weighs 5.3 MB (3.4 MB transferred)

Images are 1.1 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.1 MB

JavaScript is 652 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 652 KB

473 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.71 g CO2 per page load

3.4 MB transferred

473 requests

0.71 g CO2 per page load

Images 1.1 MiB 33%

Other 1.1 MiB 32%

JavaScript 652.4 KiB 19%

HTML 273.1 KiB 8%

CSS 96.3 KiB 3%

Fonts 77.7 KiB 2%

Other 58.9 KiB 2%

Other 48.7 KiB 1%

Other 6.3 KiB 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

JS Execution Cost

Action

11377ms total JS execution

FIX

11377ms total JS execution

https://www.mossandmolt.com/: 6277ms CPU time

Unattributable: 1576ms CPU time

https://www.mossandmolt.com/cdn/wpm/b610a19cewf693...: 932ms CPU time

https://cdn.shopify.com/extensions/01a18d57-d208-7...: 682ms CPU time

https://www.mossandmolt.com/cdn/shop/t/18/assets/m...: 591ms CPU time

Third-party scripts: 1136ms (10% of total)

Main Thread Breakdown

Style & Layout 34% Script Evaluation 30% Other 27%

Script	Total	Scripting	Parse/Compile	Party
https://www.mossandmolt.com/	6277ms	1132ms	113ms	1st
Unattributable	1576ms	144ms	0ms	1st
https://www.mossandmolt.com/cdn/wpm/b610a19cewf693d529pf324840bm6169d9b4m.js	932ms	646ms	28ms	1st
https://cdn.shopify.com/extensions/01a18d57-d208-7bfa-9eb8-ea7f7d250fe5/judgeme-838/assets/loader.js	682ms	375ms	1ms	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/mm-shrimp-bar.js?v=120813251631150360881793383007	591ms	96ms	0ms	1st
https://www.mossandmolt.com/cdn/shopifycloud/storefront/assets/storefront/remote_product_tracking-91d95044.js	356ms	192ms	6ms	1st
https://cdn.shopify.com/storefront/web-components/account.js	192ms	60ms	0ms	3rd
https://cdn.shopify.com/shopifycloud/shop-js/modules/v2/chunk.register_oML0Hu4L.esm.js	154ms	117ms	0ms	3rd
https://www.mossandmolt.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.14.0.min.js	144ms	132ms	10ms	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/slideshow.js?v=123600913920212518311792301455	105ms	22ms	0ms	1st

Showing top 10 of 16 scripts

Page Weight Inventory

Action

473 resources · 3.4 MB · 35 KB savings available

REVIEW

473 resources · 3.4 MB · 35 KB savings available

Page weight 3.4 MB exceeds 1 MB target by 2.4 MB

Got: 3.4 MB Expected: ≤ 1 MB

190 third-party resources (20% of weight)

1 resources over 200KB

473 resources · 3.4 MiB · 190 third-party 2.4 MiB over 1MB target

JavaScript 52% · 1.8 MiB

Image 33% · 1.1 MiB

Document 8% · 292.7 KiB

CSS 3% · 102.2 KiB

Font 2% · 77.7 KiB

Other 1% · 38.6 KiB

~35.3 KiB of savings available

Remove unused JavaScript: 35.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

473 resources			3.4 MiB

CSS Performance Depth

2 CSS depth issue(s) detected

REVIEW

2 CSS depth issue(s) detected

22 render-blocking stylesheet(s) -- recommended: <=3

Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.

1 `@font-face` rule(s) without `font-display` -- causes FOIT

An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.

HTTP Caching

private, max-age=0, must-revalidate

REVIEW

private, max-age=0, must-revalidate

Cache-Control header is set

Got: private, max-age=0, must-revalidate

ETag present — enables conditional (304) responses

Cache-Control

private, max-age=0, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Third-Party Impact

20% third-party, 0 ms blocking

PASS

20% third-party, 0 ms blocking

Third-party code accounts for 20% of page weight (691.0 KiB of 3.4 MiB)

Third-party blocking time is low (0 ms)

80%

20%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

37 images, 0 KB saveable

PASS

37 images, 0 KB saveable

All images are well-optimized

37 images 1.1 MB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

4 fonts (78 KB)

PASS

4 fonts (78 KB)

4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

78 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

mossmolt-jersey20.woff2 woff2 swap

Size 29 KB

Load time 31 ms

Start 195 ms

Risk FOUT — text flashes from fallback to web font

mossmolt-atkinson-700.w... woff2 swap

Size 24 KB

Load time 31 ms

Start 747 ms

Risk FOUT — text flashes from fallback to web font

mossmolt-atkinson-400.w... woff2 swap

Size 24 KB

Load time 34 ms

Start 747 ms

Risk FOUT — text flashes from fallback to web font

x-font-woff;charset=utf... woff swap

Size 1 KB

Load time 68 ms

Start 2.3 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

Optimization checklist

Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)

A+

JS Bundles

347 scripts, 35 KB unused

PASS

347 scripts, 35 KB unused

https://www.mossandmolt.com/cdn/wpm/b610a19cewf693...: 35 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 35 KB

35 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.mossandmolt.com/cdn/wpm/b610a19cewf693d529pf324840bm6169d9b4m.js	84 KB	35 KB (43%)	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/standard-actions-override.js?v=171683365447094389611792123207	1 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/page-view-event.js?v=12823247316348680231792123205	1 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/utilities.js?v=128964188705738871001792123207	5 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/component.js?v=175690430936884589731792123206	3 KB	—	✓	1st
https://cdn.shopify.com/storefront/standard-events.js	4 KB	—	✓	3rd
https://www.mossandmolt.com/cdn/shop/t/18/assets/section-renderer.js?v=165897709872489896681792123206	2 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/section-hydration.js?v=108434990705342316311792123206	1 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/morph.js?v=163551064521986254391792123207	4 KB	—	✓	1st
https://www.mossandmolt.com/cdn/shop/t/18/assets/focus.js?v=60436577539430446401792123206	1 KB	—	✓	1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

217 hints, 0 missing preconnects

PASS

217 hints, 0 missing preconnects

Page uses 217 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

prefetch

+200

210

217 resource hints configured

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

Asset Compression

All 1 asset host use brotli

PASS

All 1 asset host use brotli

cdn.shopify.com serves assets with brotli (assets: 65)

Got: cdn.shopify.com (text/javascript)

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: private, max-age=0, must-revalidate

A+

Server-Timing Observability

18 Server-Timing entries advertised

PASS

18 Server-Timing entries advertised

Server-Timing header advertises 18 timing entries

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: accept-encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

`ETag` present -- conditional GET supported

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 11.4 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall

473 requests over 9148ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

10% of JavaScript execution is third-party

First-party Third-party 1136ms · 35KB · €6/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
cdn.shopify.com cdn.shopify.com	Other	682ms	4 KB	—	€4/mo	Costly
cdn.shopify.com cdn.shopify.com	Other	192ms	10 KB	—	€1/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	154ms	15 KB	—	€1/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	58ms	1 KB	—	€0/mo	Optional
cdn.shopify.com cdn.shopify.com	Other	50ms	4 KB	—	€0/mo	Optional

cdn.shopify.com

Other

Costly

Execution 682ms

Transfer 4 KB

Monthly Cost €4/mo

cdn.shopify.com

Other

Optional

Execution 192ms

Transfer 10 KB

Monthly Cost €1/mo

cdn.shopify.com

Other

Optional

Execution 154ms

Transfer 15 KB

Monthly Cost €1/mo

cdn.shopify.com

Other

Optional

Execution 58ms

Transfer 1 KB

Monthly Cost €0/mo

cdn.shopify.com

Other

Optional

Execution 50ms

Transfer 4 KB

Monthly Cost €0/mo

These scripts may cost more than they're worth

cdn.shopify.com adds 682ms and costs ~€4/month

cdn.shopify.com takes 682ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Image Optimization

73 images, 1162 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1162 KB

2 missing alt text 24 missing dimensions 5 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.